英语听力精选进阶版 7241

美国的医生们说将来有可能通过人工方式来制造无数的卵子来帮助不孕妇女。研究人员发现当他们从妇女的卵巢里提取卵子干细胞时，这些卵子会自动生成新的卵。

A long-held theory is that women are born with all the eggs they will ever have. Researchers say they have shattered that idea by finding the stem cells which produce new eggs. Doctors at Massachusetts General Hospital used unique proteins on the surface of stem cells to fish them out of ovarian tissue.

The study, in Nature Medicine, showed that growing these cells in the laboratory resulted in new eggs being produced spontaneously. Legal and ethical¹ rules limit research on human eggs, but the same techniques repeated on mice showed the eggs could be fertilised and produce embryos².

The findings are a long way from being used in fertility clinics but the researchers said the cells had unprecedented³ potential to overcome infertility⁴. British experts said the study rewrote the rule book and opened up exciting new possibilities for women.

Quiz 听力测试

What's a long-held view about women's eggs?

Women are born with all the eggs they will ever have.

The above theory is being challenged by doctors of which country?

America.

True or false: There are some restrictions⁵ on research using human eggs.

True. Legal and ethical rules limit research using human eggs.

Has this new theory been received positively⁶ by British experts?

Yes it has. They said that it opened up exciting new possibilities for women.

Glossary⁷ 词汇表

a long-held theory 长期公认的理论

to shatter something 粉碎/驳斥

a stem cell 干细胞

to fish something out 找出原因

spontaneously 自然地/即兴地

ethical 道德的

to be fertilised (使)受孕

findings 发现

unprecedented 史无前例的

to overcome something 克服...

1 ethical   

adj.伦理的，道德的，合乎道德的

参考例句：

• It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
• It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。

2 embryos   

n.晶胚；胚，胚胎( embryo的名词复数 )

参考例句：

• Somatic cells of angiosperms enter a regenerative phase and behave like embryos. 被子植物体细胞进入一个生殖阶段，而且其行为象胚。 来自辞典例句
• Evolution can explain why human embryos look like gilled fishes. 进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样。 来自辞典例句

3 unprecedented   

adj.无前例的，新奇的

参考例句：

• The air crash caused an unprecedented number of deaths.这次空难的死亡人数是空前的。
• A flood of this sort is really unprecedented.这样大的洪水真是十年九不遇。

4 infertility   

n.不肥沃，不毛；不育

参考例句：

• It is the Geneva, Switzerland-based Biotech Company's second recombinant infertility drug. 它是瑞士生物技术公司在日内瓦的公司生产的第二种重组治疗不孕症的药。 来自英汉非文学 - 生命科学 - 生物技术制药疫苗
• Endometritis is a cause of infertility. 子宫内膜炎是不育的原子。 来自辞典例句

5 restrictions   

约束( restriction的名词复数 )； 管制； 制约因素； 带限制性的条件（或规则）

参考例句：

• I found the restrictions irksome. 我对那些限制感到很烦。
• a snaggle of restrictions 杂乱无章的种种限制

6 positively   

adv.明确地，断然，坚决地；实在，确实

参考例句：

• She was positively glowing with happiness.她满脸幸福。
• The weather was positively poisonous.这天气着实讨厌。

7 glossary   

n.注释词表；术语汇编

参考例句：

• The text is supplemented by an adequate glossary.正文附有一个详细的词汇表。
• For convenience,we have also provided a glossary in an appendix.为了方便，我们在附录中也提供了术语表。